Brother 1920CN - Color Inkjet - Fax Manuals

Table of Contents

• 31

  Chapter III. Theory of Operation

  • • 1

      Service Manual
    • 4

      Safety Information
    • 6

      General Description
    • 7

      Machine Outline
    • 8

      Specifications
    • 28

      Installing the Update Data to the Machine
    • 31

      Table of Contents
    • 31

      Theory of Operation

  • 32

    1 Overview

  • 33

    2 Mechanisms

    • 34

      Scanner Mechanism
    • 36

      Laser Printing Mechanism
      • 36

        Paper Pick-Up and Registration Mechanism
      • 37

        Print Process Mechanism
      • 39

        Heat-Fixing Mechanism
      • 40

        Paper Ejecting Mechanism
    • 41

      Sensors and Actuators

  • 43

    3 Control Electronics

• 45

  Chapter IV. Disassembly/Reassembly and Lubrication

  • 47

    1 Disassembly/Reassembly

    • 47

      Safety Precautions
    • 48

      Preparation
    • 48

      How to Access the Object Component
    • 49

      Disassembly Order Flow
    • 50

      Lower Rear Cover
    • 50

      Access Plates R and F
    • 51

      Paper Cassette
    • 52

      Document Tray ASSY
    • 54

      Upper Rear Cover
    • 55

      ADF Unit
      • 57

        Disassembling the ADF Unit
    • 62

      Scanner Unit and Control Panel ASSY
      • 65

        Disassembling the Scanner Unit
      • 70

        Disassembling the Control Panel ASSY
    • 71

      Relay PCB
    • 72

      Speaker
    • 73

      Scanner Mount
    • 76

      Paper Sub Tray and Tray Holder
    • 77

      VC Cover, VC Bracket, and VC Connector PCB (For Models Supporting Video Capture
    • 78

      Front Cover
      • 78

        Front Sub Cover (For Models Not Supporting Video Capture
    • 79

      Outer Chute and Paper Pinch Rollers
    • 80

      Main Cover
    • 81

      Switch Cover (For Models Not Equipped With a Power Switch
    • 82

      Laser Unit
    • 83

      Heat-Fixing Unit and FU Lamp
    • 87

      Fan
    • 89

      Drive Gear ASSY and Main Motor ASSY
    • 91

      NCU Shield and NCU PCB
    • 93

      Bottom Plate, Main PCB, and Bottom Insulation Film
    • 97

      Low-Voltage Power Supply PCB and Power Inlet
    • 99

      Inner Insulation Film, High-Voltage Power Supply PCB, Engine PCB, and 2Nd Cassette Relay PCB
    • 101

      Toner Sensor (Light-Receiver) PCB and Toner Sensor (LED) PCB
    • 102

      Gears and Paper Pick-Up Roller
    • 103

      Paper Feed Roller ASSY
    • 104

      Clutch Levers, Cassette Guide L, and Solenoid
    • 105

      Cleaning of High-Voltage Contacts and Grounding Contacts

  • 107

    2 Lubrication

    • 107

      1 ] ADF Unit
    • 108

      2 ] Scanner Mount
    • 109

      3 ] Drive Gear ASSY
    • 110

      4 ] Paper Cassette

• 112

  Chapter V. Maintenance Mode

  • 113

    1 Entry Into the Maintenance Mode

  • 114

    2 List of Maintenance-Mode Functions

  • 116

    3 Detailed Description of Maintenance-Mode Functions

    • 116

      EEPROM Parameter Initialization
    • 117

      Printout of Scanning Compensation Data
    • 119

      ADF Performance Test
    • 120

      Test Pattern 1
    • 121

      Firmware Switch Setting and Printout
    • 166

      Operational Check of LCD
    • 166

      Operational Check of Control Panel PCB
    • 168

      Sensor Operational Check
    • 169

      CCD Scanner Area Setting
    • 169

      EEPROM Customizing
    • 170

      Erasure of Received FAX Messages Temporarily Stored in the Flash Memory
    • 170

      Machine Error Code Indication
    • 171

      Output of Transmission Log to the Telephone Line (Not Applicable to Machines W/O Fax
    • 171

      Cancellation of the Memory Security Mode (Applicable to the European Version W/ Fax Only

• 173

  Chapter VI. Error Indication and Troubleshooting

  • 174

    1 Error Indication

    • 174

      Machine Errors
      • 174

        1 ] Error Messages On The LCD
        • 175

          Machine Error XX
    • 179

      Communications Errors (Not Applicable to Machines W/O Fax

  • 189

    2 Troubleshooting

    • 189

      Introduction
    • 189

      Precautions
    • 189

      Checking Prior to Troubleshooting
    • 191

      Troubleshooting Procedures
      • 191

        1 ] Control Panel Related
      • 191

        2 ] Telephone Related
      • 192

        3 ] Communications Related
      • 192

        4 ] Paper/Document Feeding Related
      • 193

        5 ] Print-Image Related
      • 199

        6 ] Pc-Driven Or Video Capture-Driven Printing
        • 200

          Location of High-Voltage Contacts and Grounding Contacts